How does --assume-unchanged impact git-p4?

Hello,

My workplace uses Perforce, so I've started using git-p4 to interface with it. Some of the files included in our depot are cached pre-compiled binaries which do a great deal of damage to git's performance, so after some research I found that I can "git update-index --assume-unchanged" on these files. This is great except that now I'm worried that this might prevent git-p4 from doing its thing when someone else updates these files.

So am I going to miss updates to our cached binaries using this method? Is there a better method I should be using in this scenario?

Thanks, Corey